dither

# Thryvane ASCII Shader: dither

## Objective
Implement a production-grade, interactive ASCII shader component named "dither" within the Thryvane Design System.

## Architecture & Tokens
- Canvas Base: Thryvane Minimal Dark aesthetic (#090909 background, #141414 surface-1, #262626 hairline border).
- Cell Size: 10px monospace typography.
- Accent Tint: #00ff66.
- Contrast: 115%, Brightness: 0%.
- Post-processing: Bloom (enabled), Halftone (disabled), Vignette (enabled).
- Responsive: Support fluid scaling on Mobile (375px), Tablet (768px), and Desktop (1440px).
- Accessibility: Respect prefers-reduced-motion with static fallback and proper ARIA labels.